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Reincluded modules do not splice changes into hierarchy in the correct order #1938
Title is a mouthful, but the basic issue is that if a module is included, then modified by including other modules into itself, then included again, the new includes don't get spliced into the target hierarchy correctly.
The following example shows that the order of modules is different from MRI:
module X end class Q def foo puts 'in Q' end end class Y < Q include X end module A def foo puts 'in A' super end end module X include A end module Z def foo puts 'in Z' super end end class Y include Z end class Y include X end Y.new.foo
This is the likely cause of Compass/compass-rails#179.